How Would One Define a Pluralized Version of LP vs. a Singular Version?

My friend and I have been having a serious debate over the span of an hour as to whether the term League Points is defined for all numbers including 1, in which people would say I have "1 League Points." My friend claims RIOT has defined the term LP as League Points, though not specifically for 1, and therefore it applies to all uses, including 1. I argue that the English language, even for a term like "fish", finds it acceptable for a noun when unspecified to be called in its plural form ("fishes" and all other nouns